NTLM Hash Disclosure Spoofing Vulnerability

According to the CVSS metrics, successful exploitation of this vulnerability could lead to major loss of confidentiality (C:H). What does that mean for this vulnerability?
This vulnerability discloses a user's NTLMv2 hash to the attacker who could use this to authenticate as the user.

According to the CVSS metric, user interaction is required (UI:R). What interaction would the user have to do?
Minimal interaction with a malicious file by a user such as selecting (single-click), inspecting (right-click), or performing an action other than opening or executing the file could trigger this vulnerability.

The Security Updates table indicates that this vulnerability affects all supported versions of Microsoft Windows. Why are IE Cumulative updates listed for Windows Server 2008, Windows Server 2008 R2, and Windows Server 2012 R2?
While Microsoft has announced retirement of the Internet Explorer 11 application on certain platforms and the Microsoft Edge Legacy application is deprecated, the underlying MSHTML, EdgeHTML, and scripting platforms are still supported. The MSHTML platform is used by Internet Explorer mode in Microsoft Edge as well as other applications through WebBrowser control. The EdgeHTML platform is used by WebView and some UWP applications. The scripting platforms are used by MSHTML and EdgeHTML but can also be used by other legacy applications. Updates to address vulnerabilities in the MSHTML platform and scripting engine are included in the IE Cumulative Updates; EdgeHTML and Chakra changes are not applicable to those platforms.
To stay fully protected, we recommend that customers who install Security Only updates install the IE Cumulative updates for this vulnerability.

Security updates
10.0.17763.6893 — https://support.microsoft.com/help/5052000
10.0.20348.3207 — https://support.microsoft.com/help/5051979
10.0.20348.3148 — https://support.microsoft.com/help/5052106
10.0.19044.5487 — https://support.microsoft.com/help/5051974
10.0.22621.4890 — https://support.microsoft.com/help/5051989
10.0.26100.3194 — https://support.microsoft.com/help/5051987
10.0.26100.3107 — https://support.microsoft.com/help/5052105
10.0.25398.1425 — https://support.microsoft.com/help/5051980
10.0.10240.20915 — https://support.microsoft.com/help/5052040
10.0.14393.7785 — https://support.microsoft.com/help/5052006
6.0.6003.23117 — https://support.microsoft.com/help/5052038
1 — https://support.microsoft.com/help/5051972
6.1.7601.27566 — https://support.microsoft.com/help/5052016
6.2.9200.25317 — https://support.microsoft.com/help/5052020
6.3.9600.22417 — https://support.microsoft.com/help/5052042